Police in Fife are attempting to trace a teenager who has been missing since Monday.
Liam Southby, 15, had been visiting a relative in St Andrews when he was last seen.
From Airdrie, he is known to frequently travel by bus and has connections in Dundee, Edinburgh and Fife.
Police have described him as white and of slim build and 5 ft 9 inches tall.
He has blue eyes and short dark brown hair.
When last seen, Liam was wearing black jeans, a black zipper top and a black leather jacket. He also has letters tattooed on the knuckles of his left hand.
Sergeant Gordon Miller of St Andrews police station said: “We are growing increasingly concerned for the wellbeing of Liam since he has not been seen for four days and this is unusual behaviour.
“We are keen to trace him or to hear from anyone who may have seen him since the early hours of Monday.
“Similarly if Liam himself sees this appeal, we would ask him to get in touch with us or his family.”
Anyone with information is asked to contact officers on 101.